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                <h1 id="CSS选择器"><a href="#CSS选择器" class="headerlink" title="CSS选择器"></a>CSS选择器</h1><h2 id="基本选择器"><a href="#基本选择器" class="headerlink" title="基本选择器"></a>基本选择器</h2><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">1.标签选择器
例如 p</span><span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>
<span class="token selector">选择器写标签 然后修改整个HTML文件中该标签的属性

2.类选择器
在标签中加入一句话表示加入类如
&lt;h1 class="qq"> &lt;/h1>
&lt;p class="aa"> &lt;/p>
&lt;table class="qq"> &lt;/table>

类选择器使用格式
.+类名称</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>

<span class="token selector">类选择器的延申
多类名
例如多个标签要同时具备相同的属性和不同的属性
比如多个标签要求同时具备红色字体但字号却都不同
这时候可以给标签赋予多个类属性(多个类属性中间用空格隔开)

例如
&lt;h1 class="cod abd">&lt;/h1>
&lt;h2 class="qq abd">&lt;/h2>
&lt;h3 class="qqq abd">&lt;/h3>
然后在.css的文件中可这样写
.abd</span> <span class="token punctuation">&#123;</span>
    <span class="token property">color</span><span class="token punctuation">:</span> red<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token selector">.qq</span> <span class="token punctuation">&#123;</span>
    <span class="token property">font-size</span><span class="token punctuation">:</span> 75px<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token selector">.cod</span> <span class="token punctuation">&#123;</span>
    <span class="token property">fond-size</span><span class="token punctuation">:</span> 75px<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>


<span class="token selector">3.id选择器
#id</span> <span class="token punctuation">&#123;</span>

<span class="token punctuation">&#125;</span>

<span class="token selector">4.通配符选择器
选择所有元素
*</span> <span class="token punctuation">&#123;</span>
    
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="复合选择器"><a href="#复合选择器" class="headerlink" title="复合选择器"></a>复合选择器</h2><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">1.后代选择器
标签1 标签2</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>
<span class="token selector">ul ol</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>
<span class="token selector">一层一层选
ol li p a</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>  <span class="token selector">(选中a)
&lt;ol>
    &lt;ul>
        &lt;p>&lt;a href="">&lt;/a>&lt;/p>
    &lt;/ul>
&lt;/ol>

也可以类名+后代选择器
.qq ol li</span><span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>


<span class="token selector">2.儿子选择器(只选儿子不选孙子和其他后代)
标签1>标签2</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>
<span class="token selector">body>p</span><span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>   <span class="token selector">(选中boyd儿子里面所有的p标签)

3.并集选择器
两个以上改相同属性时
选择器1,选择器2,选择器3</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>

<span class="token selector">4.兄弟选择器
.q~p</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>   <span class="token punctuation">(</span>选择.q下面所有的兄弟关系p且不包含.q<span class="token punctuation">)</span>

5.属性选择器

<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="结构伪类选择器"><a href="#结构伪类选择器" class="headerlink" title="结构伪类选择器"></a>结构伪类选择器</h2><pre class="line-numbers language-css" data-language="css"><code class="language-css">选择符
<span class="token property">E</span><span class="token punctuation">:</span>first-child  
<span class="token property">E</span><span class="token punctuation">:</span>last-child
<span class="token property">E</span><span class="token punctuation">:</span><span class="token function">nth-child</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span>  [n可以是数字也能是<span class="token function">even</span><span class="token punctuation">(</span>偶数<span class="token punctuation">)</span> <span class="token function">odd</span><span class="token punctuation">(</span>奇数<span class="token punctuation">)</span> n也能是公式 就只写一个n就是选择全部]
当n是公式时
n从零开始取值一直到最后
例如2n
n   2n   
0   0   
1   2   
2   4
3   6
当超出或者为零时自动忽略
所以
<span class="token function">2n</span><span class="token punctuation">(</span>偶数<span class="token punctuation">)</span>
2n+<span class="token function">1</span><span class="token punctuation">(</span>奇数<span class="token punctuation">)</span>
<span class="token function">5n</span><span class="token punctuation">(</span>5的倍数<span class="token punctuation">)</span>
n+<span class="token function">5</span><span class="token punctuation">(</span>从第五个开始到最后<span class="token punctuation">)</span>
-n+<span class="token function">5</span><span class="token punctuation">(</span>前五个包括第五个<span class="token punctuation">)</span>

ul <span class="token property">li</span><span class="token punctuation">:</span>first-child
选择ul li里面的第一个li
ul <span class="token property">li</span><span class="token punctuation">:</span><span class="token function">nth-child</span><span class="token punctuation">(</span>3<span class="token punctuation">)</span>
选择ul li里面的第三个li'

<span class="token property">E</span><span class="token punctuation">:</span>first-of-type
<span class="token property">E</span><span class="token punctuation">:</span>last-of-type
<span class="token property">E</span><span class="token punctuation">:</span><span class="token function">nth-of-type</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span>
div <span class="token property">span</span><span class="token punctuation">:</span>first-of-type
选择div里面的span的第一个

但是注意一下
<span class="token property">E</span><span class="token punctuation">:</span><span class="token function">nth-child</span><span class="token punctuation">(</span><span class="token punctuation">)</span>有个问题
    &lt;nav>
        &lt;p>&lt;/p>
        &lt;div>&lt;/div>
        &lt;div>&lt;/div>
    &lt;/nav>

如果写nav <span class="token property">div</span><span class="token punctuation">:</span><span class="token function">nth-child</span><span class="token punctuation">(</span>1<span class="token punctuation">)</span>
并不会选择第一个div而是谁都不选择
因为nav <span class="token property">div</span><span class="token punctuation">:</span><span class="token function">nth-child</span><span class="token punctuation">(</span>1<span class="token punctuation">)</span>
这个是先看后面的
<span class="token function">nth-child</span><span class="token punctuation">(</span>1<span class="token punctuation">)</span>----第一个孩子
然后再看看前面的div判断是不是div如果不是就不选择
但是 nav <span class="token property">div</span><span class="token punctuation">:</span><span class="token function">nth-of-type</span><span class="token punctuation">(</span>1<span class="token punctuation">)</span>就可以


区别总结
nth-child是对父元素里面的孩子进行排序然后先找到n个孩子然后看看是否和前面匹配
nth-of-type是对父元素里面的孩子进行排序先去匹配前面然后再找第几个孩子
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="属性选择器"><a href="#属性选择器" class="headerlink" title="属性选择器"></a>属性选择器</h2><pre class="line-numbers language-css" data-language="css"><code class="language-css">选择符
1.
E[att]--------------选择具有att属性的E元素
例如
a[class]  选择a标签里面有类名的

2.
E[att=<span class="token string">"val"</span>]--------选择具有att属性且属性值等于val的E元素
例如 
input[type=<span class="token string">"text"</span>]

3.
E[att^=<span class="token string">"val"</span>]-------匹配具有att属性且值以val开头的E元素
&lt;body>
    &lt;div class=<span class="token string">"qq1"</span>>&lt;/div>
    &lt;div class=<span class="token string">"qq2"</span>>&lt;/div>
    &lt;div class=<span class="token string">"qq3"</span>>&lt;/div>
    &lt;div class=<span class="token string">"a"</span>>&lt;/div>
&lt;/body>
div[class=<span class="token string">"qq"</span>]可以选择出来前三个div盒子 因为他们三个class属性都以qq开头的

4.E[att$=<span class="token string">"val"</span>]-----匹配具有att属性且值以val结尾的E元素
&lt;body>
    &lt;div class=<span class="token string">"qq1-cd"</span>>&lt;/div>
    &lt;div class=<span class="token string">"qq2-cd"</span>>&lt;/div>
    &lt;div class=<span class="token string">"qq3-cd"</span>>&lt;/div>
    &lt;div class=<span class="token string">"qq4-cz"</span>>&lt;/div>
&lt;/body>
选择前三个 
div[class=<span class="token string">"cd"</span>]

5.E[att*=<span class="token string">"val"</span>]----匹配具有att属性且值中含有val的E元素\

注意属性选择器和类选择器<span class="token punctuation">,</span>伪类选择器一样权重为10<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="伪类选择器和伪元素选择器"><a href="#伪类选择器和伪元素选择器" class="headerlink" title="伪类选择器和伪元素选择器"></a>伪类选择器和伪元素选择器</h2><pre class="line-numbers language-css" data-language="css"><code class="language-css"><span class="token selector">伪类
a:link
选择所有未被访问的链接
a:visited
选择所以已经被访问的链接
a:hover
选择鼠标指向的链接
a:active
选择鼠标选中但鼠标未松开的链接

四个顺序不能颠倒
lv包包hao
l y h a


focus用于被选中的表单
input:focus</span> <span class="token punctuation">&#123;</span>
    
<span class="token punctuation">&#125;</span>

<span class="token selector">伪元素
相当于在css里面写盒子简化HTML标签
&lt;div>

&lt;/div>

div::after</span> <span class="token punctuation">&#123;</span>
    content=<span class="token string">""</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>

<span class="token selector">::after相当于在盒子里后面加一个行内块元素
可以使用display改成块
::before相当于在盒子里前面加一个行内块元素

必须有content属性表示加的盒子里面的内容
这个权重很低为1

当鼠标经过盒子时伪元素改变样式的方法
div:hover::before

伪元素设置属性前
一般先转换格式成行内块
因为行内元素限制太多了

然后若要实现伪元素的旋转操作
首先要display成块或者行内块
因为伪元素默认是行内元素

然后给伪元素添加过渡
    &lt;style>
        div</span> <span class="token punctuation">&#123;</span>
        <span class="token property">width</span><span class="token punctuation">:</span> 30px<span class="token punctuation">;</span>
        <span class="token property">height</span><span class="token punctuation">:</span> 60px<span class="token punctuation">;</span>
        <span class="token property">margin</span><span class="token punctuation">:</span> 100px auto<span class="token punctuation">;</span>
        <span class="token property">border</span><span class="token punctuation">:</span> 1px solid pink<span class="token punctuation">;</span>
        <span class="token property">text-align</span><span class="token punctuation">:</span> center<span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token selector">div span::before</span> <span class="token punctuation">&#123;</span>
            <span class="token property">content</span><span class="token punctuation">:</span> <span class="token string">"a"</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token selector">div:hover span::before</span> <span class="token punctuation">&#123;</span>
            <span class="token property">transform</span><span class="token punctuation">:</span> <span class="token function">rotate</span><span class="token punctuation">(</span>360deg<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        <span class="token selector">div span::before</span> <span class="token punctuation">&#123;</span>
            <span class="token property">transition</span><span class="token punctuation">:</span> all 1s<span class="token punctuation">;</span>
            <span class="token property">display</span><span class="token punctuation">:</span> inline-block<span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
        
    &lt;/style>


    &lt;div>
        &lt;span> &lt;/span>
        &lt;p>1&lt;/p>
    &lt;/div><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>


                
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